md5 IP example

idk.php

<?php
$note_name = 'note.txt';
$uniqueNotePerIP = true;

if($uniqueNotePerIP){
		$note_name = 'notes/'.md5($_SERVER['REMOTE_ADDR']).'.txt';
}


if(isset($_SERVER['HTTP_X_REQUESTED_WITH'])){
	// This is an AJAX request
	
	if(isset($_POST['note'])){
		// Write the file to disk
		file_put_contents($note_name, $_POST['note']);
		echo '{"saved":1}';
	}
	
	exit;
}

$note_content = '

           Welcome to your first notepad.

             Type something here.';

if( file_exists($note_name) ){
	$note_content = htmlspecialchars( file_get_contents($note_name) );
}

$url = 'http://localhost/notepad/view.php?f='.md5($_SERVER['REMOTE_ADDR']);

?>